A Greater Yellowstone grizzly%2C part of just two healthy populations of grizzly bears in the Lower 48. What effect do mountain bikes have on wilderness and bears%3F For scientists who study them%2C there is no doubt. Photo courtesy Steven Fuller
A Greater Yellowstone grizzly%2C part of just two healthy populations of grizzly bears in the Lower 48. What effect do mountain bikes have on wilderness and bears%3F For scientists who study them%2C there is no doubt. Photo courtesy Steven Fuller